Athenahealth has an agreement to buy the Arsenal on the Charles development in Watertown for $168.5 million.

Athenahealth has an agreement to buy the Arsenal on the Charles development in Watertown for $168.5 million to expand its headquarters.

The cloud-based health-care services company, which currently leases a 330,000-square-foot building in the former armaments manufacturing site, is buying the 11-building complex from landlord Harvard University.

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